Underwater operations 261900Z feb to 071200Z mar by M/V rebecca in area bound by 33-03.07S 047-27.95W,…
South Atlantic Ocean · HYDROLANT 402/24
What this record establishes
Archived notice · 2024-03-07 13:00Z
This notice comes from the historical archive. Its archived status does not establish when or how the reported situation ended.
- Source and dates
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · NAVAREA V 76/24 270128Z FEB 24.. Issued 2024-02-27 01:52Z. First collected 2026-08-17 13:38Z; last seen in collection 2026-08-17 15:46Z. Collection dates record ingestion, not a new incident or a fresh field observation.
- Location covered
- South Atlantic Ocean. The map shows an area described by the warning; the listed coordinate is its representative center. Check the original wording for limits and qualifications.
Related notices and cancellation links
Current notices and reporting history in the South Atlantic Ocean →
Activity windows · 1 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2024-02-26 19:00Z | 2024-03-07 12:00Z | — | 233 h |
Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.
- issued
- 2024-02-27 01:52Z
- status
- Archived notice
- self-cancels
- 2024-03-07 13:00Z
- authority
- NAVAREA V 76/24 270128Z FEB 24.
- NAVAREA
- NAVAREA V · named as the source of this relay
- sea
- South Atlantic Ocean
- position
- -34.461, -48.698
- vessel
- M/V REBECCA · 100 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
WESTERN SOUTH ATLANTIC. DNC 01. 1. UNDERWATER OPERATIONS 261900Z FEB TO 071200Z MAR BY M/V REBECCA IN AREA BOUND BY 33-03.07S 047-27.95W, 33-09.39S 047-32.72W, 33-45.16S 048-00.64W, 34-01.18S 048-13.43W, 34-58.62S 049-05.23W, 35-47.05S 049-57.83W. WIDE BERTH REQUESTED. 2. CANCEL HYDROLANT 114/24. 3. CANCEL THIS MSG 071300Z MAR 24.
Reading this warning
- DNC (Digital Nautical Chart)
- A reference to one of the regions of NGA's Digital Nautical Chart, used to tell the reader which charts a warning affects.
- Underwater operations
- Divers or remotely operated vehicles are working below a vessel that cannot easily move out of the way.
- Date-time group (DTG)
- A compact UTC timestamp — day, hour and minute followed by Z — such as 201500Z for the 20th at 15:00 UTC.
- Area bound by
- Introduces a list of positions that are the corners of an area — the polygon the warning applies to.
- Position (degrees and minutes)
- How warnings write positions: degrees, a hyphen, then minutes, with N/S and E/W — 49-40.8N 003-43.8W.
- Wide berth requested
- Keep well clear — or, when a distance is given ("TWO MILE BERTH REQUESTED"), at least that far away.
- Cancellation reference
- A line that cancels an earlier warning by its number, such as CANCEL HYDROLANT 1085/12.
- HYDROLANT
- The U.S. long-range warning series for Atlantic waters outside NAVAREA IV, including the eastern Atlantic, the Mediterranean and adjoining seas.
- CANCEL THIS MSG
- The warning's own expiry: a line telling the reader when the message cancels itself.
Collected reports in this area · survey operations
72 within 180 nm since 2002 · 0 in the last 12 months · 0 listed in force now
Counts include repeat notices about the same situation. NGA archive coverage ends 2024-05; live collection began 2026-08-17. The period between them is incomplete. An empty year is not evidence that no hazards occurred.
- Survey operations by M/V polarcus alima towing 12 8100 meter long cables: a. 11 and 12 apr along trackline…2017-04-11
- Survey operations 12 apr by M/V polarcus alima towing 12 8100 meter long cables along trackline between…2017-04-11
- Survey operations by M/V polarcus alima towing 12 8100 meter long cables: a. 09 apr along trackline joining…2017-04-09
- Survey operations by M/V polarcus alima towing 12 8100 meter long cables: a. 08 apr along trackline between…2017-04-08
- Survey operations by M/V polarcus alima towing 12 8100 meter long cables: a. 07 apr along trackline between…2017-04-07
- Survey operations by M/V polarcus alima towing 12 8100 meter long cables: a. 06 apr along trackline between…2017-04-06
Month of issue in the collected archive
All available years combined. Uneven collection and repeat bulletins affect these counts; this chart does not measure the seasonality or probability of incidents.
Nearby notices listed in force · within 120 nm
No other collected notice is currently listed in force within this radius. This does not establish safe conditions.
Worldwide in the collected sources
50 survey operations listed in force · see all
Record snapshot 2026-09-25 07:14Z; source collection times vary.
Surveys
Hydrographic and scientific survey vessels, often towing long arrays. All current survey operations →
Not for navigation. This is a re-rendering of an official navigational warning for awareness; mariners must use official NAVAREA broadcasts and their national MSI service.